Re: gEDA-user: 50 mil pitch through hole perf/proto board

[Patrick Doyle <wpdster@xxxxxxxxx>]

On Fri, Sep 2, 2011 at 9:18 AM, Stephen Ecob
<silicon.on.inspiration@xxxxxxxxx> wrote:
> On Fri, Sep 2, 2011 at 10:54 PM, Tom Pope <introcept@xxxxxxxxx> wrote:
>> Why not make one? Seeedstudio's PCB manufacturing service will give
>> you (10x)100cm^2 boards for ~$25.
>> http://www.seeedstudio.com/depot/fusion-pcb-service-p-835.html?cPath=185
>
> I've done this before, but different PCB fab and different hole pitch
> - mine had a standard 100 mil square grid of holes and a second 100
> mil square grid of holes in quadrature locations to the first.  The
> PCB fabs hate this sort of board, it plays havoc with their drilling
> machines - excessive drilling time and bit consumption.  The first fab
> I approached quoted a 60% overhead because of the high hole density.
>
> I still have one or two fabbed boards and the (hastily cobbled
> together) C code for generating .PCB files for these if anyone's
> interested.
>
> An example PCB file is attached - it's zipped because ~3000 vias makes
> for a large .pcb file :)
>
Thanks for the suggestions folks... after I sent my request, I went
back to Digikey (for one final check) and this time I managed to find
the "Circuit Pattern" search key with an option for 0.05" grid.  For
some reason I didn't see that yesterday.  Anyway, it looks like I've
found what I needed.

Shifting gears slightly... I just discovered Seeedstudio a few weeks
ago when I ordered some stock prototype boards from them... The boards
are being shipped from Hong Kong and I'm still waiting for them to
arrive.

Now that I've looked at their web site more closely, I see that the
"Contact us" page lists phone numbers and addresses in China.  I guess
I could have looked at that before.  I guess I could have asked folks
about their experiences with Seeedstudio before.  I guess I could ask
now...

What other experiences have folks had with Seeedstudio?

--wpd

--wpd


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